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Author Question: The 2-manifold M in R4 given by the equations 2x1 + x4 = 0, x2 - 5x3 = 0, 0 < x2 < 1, 0 < x4 < 1 has ... (Read 32 times)

Lisaclaire

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on: May 27, 2021
The 2-manifold M in R4 given by the equations 2x1 + x4 = 0, x2 - 5x3 = 0, 0 < x2 < 1, 0 < x4 < 1 has normals n1 = 2e1+ e4, n2 = e2 - 5 e3. It is oriented by the 2-form ω(x)(v1, v2) = det(n1 n2 v1 v2). Let be a parametrization for M. Which of the following statements is true?
◦ P is orientation reversing for M, but no orientation preserving parametrization for M exists.
◦ P is orientation preserving for M.
◦ P does not determine an orientation for M.
◦ P is orientation reversing for M, but q(u) = (u1, 5u2, u2, -2u1) would be orientation preserving parametrization for M.
◦ P is orientation reversing for M, but q(u) = (-u1, 5u2, u2, 2u1) would be an orientation-preserving parametrization for M.
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Marked as best answer by Lisaclaire on May 27, 2021

reversalruiz

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Reply #1 on: May 27, 2021
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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Lisaclaire

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Reply 2 on: May 27, 2021
Wow, this really help

chereeb

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Reply 3 on: Yesterday
Gracias!

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